﻿#region GNU General Public License
/*
-----------------------------------------------------------------------------
This source file is part of jscc
    (Javascript with Classes)
For the latest info, see http://code.google.com/p/jscc

Copyright (c) 2011 Tapani Valkonen

jscc is free software: you can redistribute it and/or modify it under 
the terms of the GNU General Public License as published by the 
Free Software Foundation, either version 3 of the License, or (at your option)
any later version. 
 
jscc is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
for more details.

You should have received a copy of the GNU General Public License 
along with jscc. If not, see http://www.gnu.org/licenses/.
-----------------------------------------------------------------------------
*/
#endregion

using System;
using System.Collections;
using System.Collections.Generic;

namespace jscc
{
    public class TokenStream
    {
        private List<Token> elements;
        private int index;

        public TokenStream()
        {
            elements = new List<Token>();
            index = -1;
        }

        public void Add(Token token)
        {
            if (token == null) return;

            elements.Add(token);
        }

        public void MoveNext()
        {
            if (index < elements.Count)
              index++;
        }

        public void MoveBack(int pos)
        {
            index = pos;
        }

        public Token Current
        {
            get
            {
                return elements[index];
            }
        }

        public Token[] Tokens
        {
            get
            {
                return elements.ToArray();
            }
        }

        public int Location
        {
            get
            {
                return index;
            }
        }
    }
}